SD card interface
Owen
Posts: 100
I'm building an SD card interface for the propellar and am wondering if someone can explain to me which pins need to have pull up resostors? I was a little confused after looking at the diagram in the SD driver in the object exchange which had 6 pull up resistors
one on each propellar pin (data out, clock, Data In, CS) and then pull ups on Irq(dat1) and p9(dat2). I cant find any reference to "p9" I dont see the pin on the sd card socket i'm using from sparkfun. Are all of these pull ups actually necesary? other diagrams I have looked at only have pull ups on DI and DO.
Owen
one on each propellar pin (data out, clock, Data In, CS) and then pull ups on Irq(dat1) and p9(dat2). I cant find any reference to "p9" I dont see the pin on the sd card socket i'm using from sparkfun. Are all of these pull ups actually necesary? other diagrams I have looked at only have pull ups on DI and DO.
Owen
Comments
I'm using the same breakout board as you are, and I had success with the diagram from this thread. http://forums.parallax.com/showthread.php?p=622673
Oldbitcollector
Post Edited (Oldbitcollector) : 4/8/2007 10:35:50 PM GMT
Ok i see my problem... I'm using the sparkfun eagle symbol and it doesnt have pin 9 on the schematic but it is on the board footprint. I guess i'll add pin 9 to the symbol and give it a pull up resistor.
Owen